Added slack notifications for build status

.travis.yml

@@ -1,23 +1,21 @@
 language: python
 python:
-  - 2.7
-  - 3.6
-
+- 2.7
+- 3.6
 addons:
   apt:
     packages:
-      - libblas-dev
-      - liblapack-dev
-      - gfortran
-
+    - libblas-dev
+    - liblapack-dev
+    - gfortran
 install:
-  - pip install -U pip pip-tools
-  - pip install numpy scipy scikit-learn
-
+- pip install -U pip pip-tools
+- pip install numpy scipy scikit-learn
 script:
-  - python setup.py test
-
+- python setup.py test
 notifications:
   email:
     on_success: change
-    on_failure: change
+    on_failure: change
+  slack:
+    secure: 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